Finding the Fourth Proportional to 9,978.80, 14,959.98 and 3,975.48

Step by Step Solution

1. Step 1: Write the proportion equation
   9,978.80 : 14,959.98 = 3,975.48 : x
2. Step 2: Convert to fraction form
   9,978.80/14,959.98 = 3,975.48/x
3. Step 3: Cross multiply
   9,978.80x = 14,959.98 × 3,975.48
4. Step 4: Simplify right side
   9,978.80x = 59,473,101.29
5. Step 5: Solve for x
   x = 59,473,101.29/9,978.80
6. Step 6: Final answer
   x = 5,959.95